What is the maori roll?

The "Maori Roll" is not a recognized term in Māori culture or language. It's possible you're thinking of something else, or there's a misunderstanding.

Could you please clarify what you're referring to?

Perhaps you meant:

* The Māori Electoral Roll: This is a list of eligible Māori voters in New Zealand.

* A specific food item: There might be a food item with a similar name, but without more context, it's impossible to know.

* A specific custom or tradition: If you have any details about what you're thinking of, please share them.

Providing more information will help me understand your question better and give you the right answer.